Improvement in air-heaters



J: T. GREENWOOD.

Air-Heatr.

No. 222,395. Patented Dec. 9, 1879.

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// 1 llturrz N-PEI'ERS, PHOTO-UTHOGRAFHER, WASHINGTM. D G.

v To all whom it may concern:

:MIUNI'TED STATES P TENT OFFICE;

' JOHN T. GREENWOOD, or 'KALAMAZOO, MICHIGAN.

IMPROVEMENTQIN Al R-HEATERS.

Specification forming part of Letters Patent No. 222,395., dated December 9, 187 9, application filed September 30, 1879. F

Be it known that I, JOHN T. GREENWOOD,

I of Kalamazoo, county of Kalamazoo, State of Michigan, have invented new and useful Improvements in Air-Heaters, of which thefollowing is a specification. I

My invention has for its object the construction of a device,'by the use of which fresh cold air is conveyed into a dwelling,

- public building, or railroad-carin a heated condition. Anotlier object is to prevent the combustion of sootin chimneys and pipes.

The prominent features of theutility of such a device are- First, economy. Bfpractical experiments l with my device I find a saving of at leastv r one-halfthe fuel is effected over the ordinary consumption without its use. L

Second, health. By its use the people jbreathe pure Warm air, obviating the inhalation of noxious poison and cold drafts.

Third, safety. By the use of my heater conflagrations are prevented;

In the accompanying drawings, forming a .part of this specification, Figure l is a perspective of the device as adjusted to a stove; f Fig. 2, a longitudinal section Fig. 3, perspective of device, showing top end; and Fig. 4, C surface view of top.

The heater consists in a cylindrical. drum,

B, in which is located pipe ortubesA and 0 c.

' In the device I have constructed, tube A extends obliquely-through the drum B. (Seen linFig. 2.) tached an elbow, A, forthe purpose of delliveringthe heated air out into the room, as-

To the topof said tube is at the" hot draft pf air without its use would ascend directly to the upper ceiling. To the y lower end of said tube A is connected pipe 0, having a funnel-shaped orifice, f, forthe purpose of receiving the air inthe room near the floor, 'wheuthe device is used for warming a roomwithout the introduction of cold 1 "air from outside. To

pipe 6 e, (illustrated in Fig. 1,) which extends down through the floor andout through the.

pipe 0 is connected sill. y. When thus arranged, cold :air is transmit- I fted through pipes e e, G, and tube A, in the closed at the bottom, and having a plate, F,

hun g or stationeda little below it, which. plate may be much larger, if deemed practicable, and .notched or perforated, to surround the tubes. I call this feature of my invention a flame and spark arrester, as it retards them from entering the stove-pipe, while the smoke readily passes through the perforations 5 also,

by the flame being arrested at this point it is V thrown back around the tubes and surface of the drum, whereby greater heat is obtained.

In manufacturing the device, the heads of the drum may be cast with raised rims or shoal ders surrounding the perforations through them, to which can be attached the tubes A and c 0. ,An illustration of said rims is shown at D, which rim connects with pipe h and K, which set over the hole in stove S intendedfor pipe.

It will be seen by the construction of my device that theflames come directly in 0011 tact with tubes A and 0 0,which is deemed a great improvement over the commondouble cylinder drum. i To illustrate, pipe A may be located exactly perpendicular, or otherwise, and may I be bulged, bent,or elbowed in the center, as

also may pipe 0 c be located as shown, or

extend obliquely or horizontally through the drum B, and may consist of any number and form, so long as my purpose is effected, by means of pipes passing through a drum, substantia-lly as shown and described,'whether said drum and tubes be provided with flamearrester F D, elbow A, and pipe 0, or whether other accessories equivalent be substituted.

What I claim as new is-- 1. Drum B, with tubes A and 0-0,.81b0W A, perforated cylinder D, plate F,and pipe I perforated cylinder D and deflecting-plate F, in combination with drum B, substantially as shown and specified, for the purpose set forth.

J. T. GREENWOOD. Witnesses:

J. O. KORTENHOFF, AMos D. ALLEN. 

